JP2704136B2 - Wireless transceiver - Google Patents
Wireless transceiverInfo
- Publication number
- JP2704136B2 JP2704136B2 JP7153170A JP15317095A JP2704136B2 JP 2704136 B2 JP2704136 B2 JP 2704136B2 JP 7153170 A JP7153170 A JP 7153170A JP 15317095 A JP15317095 A JP 15317095A JP 2704136 B2 JP2704136 B2 JP 2704136B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmission
- local oscillation
- receiving
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005540 biological transmission Effects 0.000 claims description 59
- 230000010355 oscillation Effects 0.000 claims description 50
- 238000001514 detection method Methods 0.000 claims description 20
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
- Transmitters (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Noise Elimination (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は送信および受信を同時に
行う無線送受信機に関し、特に局部発振信号を分周する
分周回路を含みＰＬＬ（位相同期ループ）を構成して局
部発振信号を生成する受信局部発振手段を有する無線送
受信機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio transceiver for simultaneously transmitting and receiving signals, and more particularly to a PLL (Phase Locked Loop) including a frequency dividing circuit for dividing a local oscillation signal to generate a local oscillation signal. The present invention relates to a wireless transceiver having a receiving local oscillator.
【０００２】[0002]
【従来の技術】図３は従来の無線送受信機の一例を示す
ブロック図である。この種の無線送受信機としては例え
ば携帯電話機がある。2. Description of the Related Art FIG. 3 is a block diagram showing an example of a conventional radio transceiver. A mobile phone is an example of this type of wireless transceiver.
【０００３】ここで、アンテナ１および送受共用フィル
タ２を介して受信される受信信号Ｓ１は、周波数混合回
路３において局部発振信号Ｓ３と混合されて中間周波信
号に変換された後、中間周波増幅回路４により増幅され
て中間周波信号Ｓ２として出力される。局部発振信号Ｓ
３は受信局部発振手段８により生成される。Here, a received signal S1 received via an antenna 1 and a transmission / reception shared filter 2 is mixed with a local oscillation signal S3 in a frequency mixing circuit 3 and converted into an intermediate frequency signal. 4 and output as an intermediate frequency signal S2. Local oscillation signal S
3 is generated by the receiving local oscillation means 8.
【０００４】一方、通話時に送信部６が出力する送信信
号Ｓ４は、送受共用フィルタ２およびアンテナ１を介し
て送信される。なお、待機時は受信のみ行うが、通話時
には受信および送信を同時に行う。On the other hand, a transmission signal S 4 output from the transmission unit 6 during a call is transmitted via the transmission / reception shared filter 2 and the antenna 1. Note that only reception is performed during standby, but reception and transmission are performed simultaneously during a call.
【０００５】受信局部発振手段８は、局部発振信号Ｓ３
を出力するＶＣＯ（電圧制御発振回路）８１と、局部発
振信号Ｓ３を分周する分周回路８２と、基準信号を生成
する基準周波数発振回路８３と、分周出力と基準信号と
の位相差を検出する位相比較回路８４と、高周波成分を
除去するローパスフィルタ８５と、リジェクションフィ
ルタ８６とからなるＰＬＬ（位相同期ループ）を有して
構成される。[0005] The receiving local oscillation means 8 outputs a local oscillation signal S3.
(VCO) 81 that outputs a signal, a frequency divider 82 that divides the local oscillation signal S3, a reference frequency oscillator 83 that generates a reference signal, and a phase difference between the divided output and the reference signal. A phase comparison circuit 84 for detecting, a low-pass filter 85 for removing high-frequency components, and a PLL (phase locked loop) including a rejection filter 86 are provided.
【０００６】ところで、通話時に高レベルの送信信号が
受信側の回路に侵入した場合、受信感度低下や受信局部
発振手段の誤動作等が生じて受信機能に障害が発生す
る。このような障害発生を軽減するために、シールド効
果を有する金属板等を使用して受信側を遮蔽すると共
に、特に受信局部発振手段８の誤動作を防止するため
に、分周回路８２の入力側にリジェクションフィルタ８
６を設けている。When a high-level transmission signal invades a circuit on the receiving side during a call, the receiving function is deteriorated due to a decrease in receiving sensitivity, malfunction of the receiving local oscillation means, and the like. In order to reduce the occurrence of such a failure, the receiving side is shielded by using a metal plate or the like having a shielding effect. In particular, in order to prevent malfunction of the receiving local oscillation means 8, the input side of the frequency dividing circuit 82 is Rejection filter 8
6 are provided.
【０００７】すなわち、送信信号が空間伝搬によって受
信局部発振手段８へ侵入し、局部発振信号Ｓ３とのレベ
ル差が少ない状態で分周回路８２へ入力してきた場合、
分周回路８２は誤動作して正常な局部発振信号Ｓ３を生
成できなくなる。特にアンテナが直接本体に取り付けら
れている機器においては、高レベルの送信信号が侵入し
てくる。このため、分周回路８２の入力側にリジェクシ
ョンフィルタ８６を接続し、侵入する送信信号を局部発
振信号Ｓ３に対して充分に減衰させるようにしている。That is, when a transmission signal enters the receiving local oscillation means 8 by spatial propagation and enters the frequency dividing circuit 82 with a small level difference from the local oscillation signal S3,
The frequency divider 82 malfunctions and cannot generate a normal local oscillation signal S3. Particularly, in a device in which an antenna is directly attached to a main body, a high-level transmission signal enters. For this reason, a rejection filter 86 is connected to the input side of the frequency dividing circuit 82 so as to sufficiently attenuate the intruding transmission signal with respect to the local oscillation signal S3.
【０００８】レジェクションフィルタ８６の特性は、例
えば図２に示すように、送信信号の周波数に対し低イン
ピーダンスを呈して減衰を与えるように構成されてい
る。また、局部発振信号Ｓ３の周波数が送信信号Ｓ４の
周波数に近いために、通過させるべき局部発振信号Ｓ３
に対しても減衰を与えている。The characteristic of the rejection filter 86 is, for example, as shown in FIG. 2, so that it exhibits a low impedance with respect to the frequency of the transmission signal to provide attenuation. Also, since the frequency of the local oscillation signal S3 is close to the frequency of the transmission signal S4, the local oscillation signal S3 to be passed is
Is also attenuated.
【０００９】[0009]
【発明が解決しようとする課題】上述したように従来の
無線送受信機では、分周回路を含むＰＬＬで構成される
受信局部発振手段に送信信号が侵入し、分周回路が誤動
作しないようにするために、分周回路の入力側にリジェ
クションフィルタを接続し、侵入する送信信号を減衰さ
せている。As described above, in the conventional radio transceiver, the transmission signal does not enter the receiving local oscillation means constituted by the PLL including the frequency dividing circuit so that the frequency dividing circuit does not malfunction. For this purpose, a rejection filter is connected to the input side of the frequency dividing circuit to attenuate an intruding transmission signal.
【００１０】しかし、このリジェクションフィルタは、
本来通過させべき局部発振信号に対しても減衰を与える
ため、分周回路へ入力する局部発振信号のレベルが減少
して動作が不安定となる。この通過損失を補償するため
に局部発振信号のレベルを増大させた場合、受信局部発
振手段は待機時においても常時動作するので、機器の消
費電力が増加し、特に小容量のバッテリーで動作する携
帯電話機では、使用可能時間が短くなるという問題点が
ある。However, this rejection filter is
Since the local oscillation signal that should be passed is also attenuated, the level of the local oscillation signal input to the frequency dividing circuit decreases and the operation becomes unstable. When the level of the local oscillation signal is increased to compensate for the passing loss, the receiving local oscillation means always operates even in the standby mode, so that the power consumption of the device increases, and in particular, the portable operating with a small capacity battery. The telephone has a problem that the usable time is shortened.
【００１１】本発明の目的は、分周回路を含むＰＬＬで
構成される受信局部発振手段に送信信号が侵入して発生
する誤動作を、消費電力を抑えて防止できる無線送受信
機を提供することにある。An object of the present invention is to provide a radio transceiver capable of preventing a malfunction caused by a transmission signal entering a receiving local oscillation means constituted by a PLL including a frequency dividing circuit while suppressing power consumption. is there.
【００１２】[0012]
【課題を解決するための手段】本発明の無線送受信機
は、通話時に送信信号を出力する送信手段と、受信信号
および局部発振信号を常時受けて混合し中間周波信号を
出力する周波数混合手段と、前記局部発振信号を分周す
る分周回路を含みＰＬＬ（位相同期ループ）を構成して
前記局部発振信号を生成する受信局部発振手段と、前記
送信手段の出力側に設けられ前記送信信号を検出して検
出信号を送出する送信検出手段と、前記分周回路の入力
側に設けられ前記検出信号を受けたときに利得を増大さ
せて前記局部発振信号を増幅する増幅手段と、前記分周
回路の入力側に設けられ前記検出信号を受けたときに機
能して前記分周回路に侵入する前記送信信号の周波数成
分を減衰させるフィルタ手段とを備える。A radio transceiver according to the present invention comprises a transmitting means for outputting a transmission signal during a call, and a frequency mixing means for constantly receiving and mixing a received signal and a local oscillation signal and outputting an intermediate frequency signal. Receiving local oscillation means for generating a local oscillation signal by forming a PLL (phase locked loop) including a frequency dividing circuit for dividing the local oscillation signal, and transmitting the transmission signal provided on an output side of the transmission means. Transmission detecting means for detecting and transmitting a detection signal; amplifying means provided on an input side of the frequency dividing circuit for increasing gain when receiving the detection signal to amplify the local oscillation signal; And a filter means provided on the input side of the circuit and functioning when receiving the detection signal and attenuating a frequency component of the transmission signal entering the frequency dividing circuit.
【００１３】上記構成において、前記増幅手段は、電源
電流に応じて利得を変化させる増幅回路と、前記検出信
号を受けたときに前記増幅回路へ供給する前記電源電流
を増大させる電流源回路とを有し、また、前記フィルタ
手段は、前記送信信号の周波数に対し低インピーダンス
を呈するリジェクションフィルタと、このリジェクショ
ンフィルタと接地間に設けられ前記検出信号を受けたと
きに動作して前記リジェクションフィルタを機能させる
スイッチとを有している。In the above configuration, the amplifying means includes an amplifier circuit for changing a gain according to a power supply current, and a current source circuit for increasing the power supply current supplied to the amplifier circuit when receiving the detection signal. A rejection filter having a low impedance with respect to a frequency of the transmission signal; and a rejection filter provided between the rejection filter and a ground and operated when receiving the detection signal to operate the rejection filter. And a switch for operating the filter.
【００１４】[0014]
【実施例】次に本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
【００１５】図１は本発明の一実施例を示すブロック図
であり、図３に示した従来例と同一構成要素には同一符
号を付している。FIG. 1 is a block diagram showing one embodiment of the present invention, and the same reference numerals are given to the same components as those in the conventional example shown in FIG.
【００１６】ここで、アンテナ１および送受共用フィル
タ２を介して受信される受信信号Ｓ１は、周波数混合回
路３において局部発振信号Ｓ３と混合されて中間周波信
号に変換された後、中間周波増幅回路４により増幅され
て中間周波信号Ｓ２として出力される。局部発振信号Ｓ
３は受信局部発振手段５により生成される。The received signal S1 received via the antenna 1 and the transmission / reception shared filter 2 is mixed with the local oscillation signal S3 in the frequency mixing circuit 3 and converted into an intermediate frequency signal. 4 and output as an intermediate frequency signal S2. Local oscillation signal S
3 is generated by the receiving local oscillation means 5.
【００１７】一方、通話時に送信部６が出力する送信信
号Ｓ４は、送受共用フィルタ２およびアンテナ１を介し
て送信される。また、送信信号Ｓ４を検出する送信検出
回路７を送信部６の出力側に設けてあり、送信部６が送
信信号Ｓ４を出力したときに、送信検出回路７は送信信
号Ｓ４を検出して送信検出信号Ｓ５を出力する。On the other hand, a transmission signal S4 output from the transmission section 6 during a call is transmitted via the transmission / reception shared filter 2 and the antenna 1. Further, a transmission detection circuit 7 for detecting the transmission signal S4 is provided on the output side of the transmission unit 6, and when the transmission unit 6 outputs the transmission signal S4, the transmission detection circuit 7 detects the transmission signal S4 and transmits the signal. The detection signal S5 is output.
【００１８】次に受信局部発振手段５について説明す
る。Next, the receiving local oscillation means 5 will be described.
【００１９】受信局部発振手段５は、局部発振信号Ｓ３
を出力するＶＣＯ（電圧制御発振回路）８１と、局部発
振信号Ｓ３を分周する分周回路８２と、基準信号を生成
する基準周波数発振回路８３と、分周出力と基準信号と
の位相差を検出する位相比較回路８４と、高周波成分を
除去するローパスフィルタ８５と、リジェクションフィ
ルタ８６とを有し、これらは従来例と同じ構成要素であ
る。また更に、局部発振信号Ｓ３を増幅して分周回路８
２へ送出する増幅回路５１と、送信検出信号Ｓ５に応じ
て増幅回路５１へ供給する電源電流を制御する電流源回
路５２と、送信検出信号Ｓ５に応じてリジェクションフ
ィルタ８６を接地させるスイッチ５３とを有している。The receiving local oscillation means 5 generates a local oscillation signal S3
(VCO) 81 that outputs a signal, a frequency divider 82 that divides the local oscillation signal S3, a reference frequency oscillator 83 that generates a reference signal, and a phase difference between the divided output and the reference signal. It has a phase comparison circuit 84 for detection, a low-pass filter 85 for removing high-frequency components, and a rejection filter 86, which are the same components as in the conventional example. Further, the local oscillation signal S3 is amplified and the frequency dividing circuit 8
2, a current source circuit 52 for controlling a power supply current supplied to the amplifier circuit 51 according to the transmission detection signal S5, and a switch 53 for grounding a rejection filter 86 according to the transmission detection signal S5. have.
【００２０】ところで、電流源回路５２は、送信検出信
号Ｓ５を受けたとき、すなわち送信信号Ｓ４が送出され
たときのみ、増幅回路５１への供給電流を増大させる。
増幅回路５１は供給電流の増大により利得を増加させ、
分周回路８２ヘ出力する局部発振信号のレベルを上昇さ
せる。The current source circuit 52 increases the current supplied to the amplifier circuit 51 only when receiving the transmission detection signal S5, that is, when transmitting the transmission signal S4.
The amplification circuit 51 increases the gain by increasing the supply current,
The level of the local oscillation signal output to the frequency dividing circuit 82 is increased.
【００２１】また、スイッチ５３は、送信検出信号Ｓ５
を受けたとき、すなわち送信信号Ｓ４が送出されたとき
のみオン状態となり、リジェクションフィルタ８６の一
方端側を接地させて、リジェクションフィルタ８６を機
能させる。リジェクションフィルタ８６は、例えば、
Ｌ，Ｃ共振回路で形成され、図２に示すように、送信信
号の周波数に対し低インピーダンスを呈して減衰を与え
るように構成されている。The switch 53 is connected to the transmission detection signal S5
Is received, that is, only when the transmission signal S4 is sent out, the one end side of the rejection filter 86 is grounded, and the rejection filter 86 functions. The rejection filter 86 is, for example,
It is formed of L and C resonance circuits, and as shown in FIG. 2, is configured to exhibit a low impedance with respect to the frequency of the transmission signal to give attenuation.
【００２２】いま、スイッチ５３がオフ状態であれば、
リジェクションフィルタ８６は機能しないので、通過信
号に減衰を与えることはない。スイッチ５３がオンすれ
ば、リジェクションフィルタ８６は機能し、侵入してく
る送信信号に対して大きな減衰を与えと共に、局部発振
信号に対しても減衰を与える。しかし、このとき、増幅
回路５１が利得を増加させて局部発振信号の通過損失を
補償する。If the switch 53 is off,
Since the rejection filter 86 does not function, it does not attenuate the passing signal. When the switch 53 is turned on, the rejection filter 86 functions, giving a large attenuation to the intruding transmission signal and also giving an attenuation to the local oscillation signal. However, at this time, the amplification circuit 51 increases the gain to compensate for the passage loss of the local oscillation signal.
【００２３】このように、送信信号が送出されていると
きのみ、リジェクションフィルタ８６を機能させ、同時
に増幅回路５１の電流を増大させて利得を増加させるこ
とにより、受信局部発振手段５に侵入してくる送信信号
をリジェクションフィルタ８６により減衰させると共
に、局部発振信号の通過損失を補償するので、分周回路
８２を安定に動作させることができる。また、送信信号
が送出されているときのみ増幅回路５１の電流を増大さ
せ、通常は必要最小限の電流で動作させるので、消費電
力を抑えることができる。As described above, only when the transmission signal is being transmitted, the rejection filter 86 is operated, and at the same time, the current of the amplifier circuit 51 is increased to increase the gain. Since the incoming transmission signal is attenuated by the rejection filter 86 and the passage loss of the local oscillation signal is compensated, the frequency dividing circuit 82 can be operated stably. Further, the current of the amplifier circuit 51 is increased only when a transmission signal is being transmitted, and the amplifier circuit 51 is normally operated with a minimum necessary current, so that power consumption can be suppressed.
【００２４】[0024]
【発明の効果】以上説明したように本発明は、局部発振
信号を分周する分周回路を含みＰＬＬ（位相同期ルー
プ）を構成して局部発振信号を生成する受信局部発振手
段を有する無線送受信機において、分周回路の入力側に
局部発振信号を増幅する増幅回路および侵入する送信信
号を減衰させるリジェクションフィルタを接続し、送信
信号が送出されているときのみ、リジェクションフィル
タを機能させ、同時に増幅回路の電流を増大させて利得
を増加させることにより、リジェクションフィルタによ
る局部発振信号の通過損失を補償して送信信号を減衰さ
せるので、送信信号の侵入に対して分周回路は誤動作す
ることなく安定に動作する。また、送信信号が送出され
ているときのみ増幅回路の電流を増大させ、通常は必要
最小限の電流で動作させるので、消費電力を抑えること
ができる。As described above, the present invention relates to a radio transmission / reception system having a receiving local oscillation means for generating a local oscillation signal by forming a PLL (phase locked loop) including a frequency dividing circuit for dividing a local oscillation signal. In the machine, an amplification circuit for amplifying the local oscillation signal and a rejection filter for attenuating an intruding transmission signal are connected to the input side of the frequency dividing circuit, and only when the transmission signal is transmitted, the rejection filter is operated. At the same time, the gain of the amplifier circuit is increased to increase the gain, thereby compensating for the transmission loss of the local oscillation signal due to the rejection filter and attenuating the transmission signal. It works stably without any. Further, the current of the amplifier circuit is increased only when the transmission signal is being transmitted, and the amplifier circuit is normally operated with a minimum necessary current, so that power consumption can be suppressed.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
【図２】図１に示したリジェクションフィルタ８６の特
性を示す図である。FIG. 2 is a diagram showing characteristics of a rejection filter 86 shown in FIG.
【図３】従来の無線送受信機の一例を示すブロック図で
ある。FIG. 3 is a block diagram illustrating an example of a conventional wireless transceiver.
３ 周波数混合回路 ５ 受信局部発振手段 ６ 送信部 ７ 送信検出回路 ５１ 増幅回路 ５２ 電流源回路 ５３ スイッチ ８１ ＶＣＯ（電圧制御発振回路） ８２ 分周回路 ８３ 基準周波数発振回路 ８４ 位相比較回路 ８５ ローパスフィルタ ８６ リジェクションフィルタ Ｓ１ 受信信号 Ｓ３ 局部発振信号 Ｓ４ 送信信号 Ｓ５ 送信検出信号 3 Frequency Mixing Circuit 5 Reception Local Oscillator 6 Transmitter 7 Transmission Detector 51 Amplifier 52 Current Source 53 Switch 81 VCO (Voltage Controlled Oscillator) 82 Frequency Divider 83 Reference Frequency Oscillator 84 Phase Comparator 85 Low Pass Filter 86 Rejection filter S1 Received signal S3 Local oscillation signal S4 Transmission signal S5 Transmission detection signal
Claims (3)
と、受信信号および局部発振信号を常時受けて混合し中
間周波信号を出力する周波数混合手段と、前記局部発振
信号を分周する分周回路を含みＰＬＬ（位相同期ルー
プ）を構成して前記局部発振信号を生成する受信局部発
振手段と、前記送信手段の出力側に設けられ前記送信信
号を検出して検出信号を送出する送信検出手段と、前記
分周回路の入力側に設けられ前記検出信号を受けたとき
に利得を増大させて前記局部発振信号を増幅する増幅手
段と、前記分周回路の入力側に設けられ前記検出信号を
受けたときに機能して前記分周回路に侵入する前記送信
信号の周波数成分を減衰させるフィルタ手段とを備える
ことを特徴とする無線送受信機。1. A transmitting means for outputting a transmission signal during a call, a frequency mixing means for constantly receiving and mixing a reception signal and a local oscillation signal and outputting an intermediate frequency signal, and a frequency dividing circuit for dividing the local oscillation signal Receiving local oscillation means for generating the local oscillation signal by forming a PLL (phase locked loop), and transmission detection means provided at an output side of the transmission means for detecting the transmission signal and transmitting a detection signal. Amplifying means provided on the input side of the frequency dividing circuit for increasing the gain when receiving the detection signal and amplifying the local oscillation signal; and receiving the detection signal provided on the input side of the frequency dividing circuit. A wireless transmission / reception device, comprising: a filter unit that functions when the transmission signal enters the frequency dividing circuit to attenuate a frequency component of the transmission signal.
を変化させる増幅回路と、前記検出信号を受けたときに
前記増幅回路へ供給する前記電源電流を増大させる電流
源回路とを有していることを特徴とする請求項１記載の
無線送受信機。2. The amplifying means includes an amplifier circuit that changes a gain according to a power supply current, and a current source circuit that increases the power supply current supplied to the amplifier circuit when receiving the detection signal. The wireless transceiver according to claim 1, wherein:
波数に対し低インピーダンスを呈するリジェクションフ
ィルタと、このリジェクションフィルタと接地間に設け
られ前記検出信号を受けたときに動作して前記リジェク
ションフィルタを機能させるスイッチとを有しているこ
とを特徴とする請求項１記載の無線送受信機。3. The rejection filter according to claim 1, wherein the rejection filter has a low impedance with respect to the frequency of the transmission signal, and is provided between the rejection filter and ground to operate when receiving the detection signal. The wireless transceiver according to claim 1, further comprising: a switch that functions as a filter.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7153170A JP2704136B2 (en) | 1995-06-20 | 1995-06-20 | Wireless transceiver |
| US08/660,889 US5732329A (en) | 1995-06-20 | 1996-06-10 | Radio transmitter/receiver |
| CA002178777A CA2178777C (en) | 1995-06-20 | 1996-06-11 | Radio transmitter/receiver |
| AU55980/96A AU703177B2 (en) | 1995-06-20 | 1996-06-14 | Radio transmitter/receiver |
| EP96304456A EP0750403B1 (en) | 1995-06-20 | 1996-06-14 | Radio transmitter/receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7153170A JP2704136B2 (en) | 1995-06-20 | 1995-06-20 | Wireless transceiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH098694A JPH098694A (en) | 1997-01-10 |
| JP2704136B2 true JP2704136B2 (en) | 1998-01-26 |
Family
ID=15556591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7153170A Expired - Fee Related JP2704136B2 (en) | 1995-06-20 | 1995-06-20 | Wireless transceiver |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5732329A (en) |
| EP (1) | EP0750403B1 (en) |
| JP (1) | JP2704136B2 (en) |
| AU (1) | AU703177B2 (en) |
| CA (1) | CA2178777C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6378026B1 (en) * | 1998-11-09 | 2002-04-23 | Sipex Corporation | Connection detection circuit and method |
| JP4246622B2 (en) * | 2003-12-26 | 2009-04-02 | 古野電気株式会社 | Microwave frequency converter |
| US20080037507A1 (en) * | 2004-11-25 | 2008-02-14 | Yoshito Fukumoto | Wireless Communication Device |
| US9287886B2 (en) * | 2008-02-29 | 2016-03-15 | Qualcomm Incorporated | Dynamic reference frequency for fractional-N Phase-Locked Loop |
| US20120040628A1 (en) * | 2010-08-13 | 2012-02-16 | Infineon Technologies Ag | Transceiver with Interferer Control |
| CN103780227B (en) * | 2012-10-18 | 2016-05-04 | 晨星软件研发(深圳)有限公司 | Local oscillations source generator and associated communication system and local oscillations source generating method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI91821C (en) * | 1991-02-22 | 1994-08-10 | Nokia Mobile Phones Ltd | Automatic frequency control switching of the radio telephone |
| US5276913A (en) * | 1991-11-25 | 1994-01-04 | Motorola, Inc. | Phase-locked-loop circuit for radio transceiver |
| JPH08506235A (en) * | 1993-11-22 | 1996-07-02 | フィリップス エレクトロニクス ネムローゼ フェン ノートシャップ | Telecommunication system and first station, second station and transceiver for the system |
| US5499392A (en) * | 1994-07-19 | 1996-03-12 | Matsushita Communication Industrial Corporation Of America | Filter having a variable response time for filtering an input signal |
-
1995
- 1995-06-20 JP JP7153170A patent/JP2704136B2/en not_active Expired - Fee Related
-
1996
- 1996-06-10 US US08/660,889 patent/US5732329A/en not_active Expired - Fee Related
- 1996-06-11 CA CA002178777A patent/CA2178777C/en not_active Expired - Fee Related
- 1996-06-14 AU AU55980/96A patent/AU703177B2/en not_active Ceased
- 1996-06-14 EP EP96304456A patent/EP0750403B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2178777C (en) | 2000-04-04 |
| JPH098694A (en) | 1997-01-10 |
| AU5598096A (en) | 1997-01-09 |
| CA2178777A1 (en) | 1996-12-21 |
| US5732329A (en) | 1998-03-24 |
| EP0750403A3 (en) | 2001-05-16 |
| AU703177B2 (en) | 1999-03-18 |
| EP0750403B1 (en) | 2002-10-16 |
| EP0750403A2 (en) | 1996-12-27 |
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